Description: MULTI PURPOSE: Sit up assistant device is suitable for doing support lateral stretches, push ups, sit ups, core training, core twist, bends, and flat support, this will help you build a beautiful body. Perfect for adults, teens and other fitness enthusiasts. EASY TO USE: Hamstring exercise strap is easy to set up within 10s, for beginners to advanced. The strap length is adjustable, and there are multiple ways to use it for most types of beds and doors or anywhere else you find a fit. DURABLE MATERIAL: The sit up bar is made of good materials, provides maximum stability and control; the high density sponge on the bar provides comfortable ankle or foot support, and nylon webbing is wear resistant and can be used long time. LIGHTWEIGHT & PORTABLE: The hamstring attachment is lightweight and portable, which is easy and convenient to carry and store, suitable for home and travel. Must have for home gym equipment or travel gym equipment. GREAT TOOL FOR TRAINING: The hamstring exercise equipment can help you exercise your leg muscles, activate and relax your legs for stronger strength. Easy to set up, allowing you to quickly enjoy a sit up workout. Great for home, gym and other occasions. Specification: Material: Plastic, Sponge and Nylon Webbing Size Chart: Adjustable Length: 30cm-45cm/11.81-17.72inch Package Includes: 1 Hamstring Strap Note: Please allow slightly errors due to manual measurement and different monitors.